Nero Burning Error

I'm on a medion computer intel duel core using windows vista, i have been burning away happily with no problems untill today, always use the same type discs for burning RiVision DVD-R 16X and have never had a problem. I have no idea what is wrong. natuarly i tried a few discs incase i had a few bad ones in among my pack..but to no avail. Below is my Log hopefully some kind soul can point me in the right direction as to what's going wrong. Also i also tried to burn other video files on my hard drive that i had already succefully burned just in case the actual movie file was in some way corrupt....still wouldnt burn.

Gwendolin thanks for your input, i downloaded and ran the aspi updtae but from this log i am posting i don't think it shows? I also updated successfully my firmware (Thanks) I have yet to update Nero...I know the discs aren't best qyuality but its all i have at the moment. Still no joy burning, here is my latest Log.....Maybe it throws up something different now that i have updated the firmware? Thanks for your help this far.